dpkg -l | grep signed
ii fonts-cantarell 0.0.24-1~ubuntu16.04.0 all sans serif font family designed for on-screen readability
ii fonts-kacst-one 5.0+svn11846-7 all TrueType font designed for Arabic language
ii unity 7.4.0+16.04.20160906-0ubuntu1 amd64 Interface designed for efficiency of space and interaction.
ii unity-schemas 7.4.0+16.04.20160906-0ubuntu1 all Interface designed for efficiency of space and interaction.